Mirrored from Sudopedia, the Free Sudoku Reference Guide
Further eliminations can be made by examining the houses. A house which already contains a certain digit does not allow another placement. The remaining candidates for that digit can therefore be eliminated from the house. These are also known as direct eliminations.
When singles are placed, more direct eliminations can be made.
Finally, the player must use more advanced solving techniques to make additional eliminations. These are indirect eliminations, because they are not the immediate result of an individual placement.This page was last modified 18:18, 11 October 2007.